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Full text of "The Cambridge Natural History"

PICHY-CIEGO   AND   APAR

and   the   third   enormously   enlarged.     This   latter   fact   recalls
the arrangement characteristic  of Myrinecopliaga.     The pelvis is

greatly attached by the
isehium to the verte-
bral column. The
femur has a third tro-
chanter.

The various forms
of Armadillos are
largely distinguished
by the number of mov-
able thin bands of
scutes lying between
the large anterior and
posterior shields. Thus
we have Dasypus sex-
cincti^s, Tolypeiutes tri-
cinctus, etc.

The little Pichi-
ehago (or, more cor-

T>i/'»liv     r-if»o-n^
x •Lt-uJ  ~ <-<-<-'to<-V,

'2/S,\vllidl

only grows to about 5
inches in length, has
no movable bands at all. It is covered with a uniform series
of plates, which, moreover, are not discontinuous at the neck.
It differs, too, from the prevailing Armadillo-type by the absence
of conspicuous external ears. In. the anterior part of the body
the armature consists of little more than the homy plates, which
in other Armadillos overlie the bony dermal plates. In the
hinder region the bony plates are strong. In this animal., there-
fore, we have the dermal armature reduced to a minimum; but
it must be noticed that, like the extinct Glyptodons, the arma-
ture is continuous and nowhere ringed.

The genus Tofypeutes, of which the best-known, species is T.
trivinctus, the Apar (there are two other species in the genus), can
roll itself up into a ball like the Pill-Millipede (Gloweris), and,
protected by its armour, roll away from its enemies like the
Arthropod under similar ciremustanees. This mode ol* protection,
be it observed, is aW adopted by the Pangolin and by the I fudge-

FIG. 102,—Pelvis and sacrum of Armadillo.
<sexcinctus. ac, Acetabulum ; -II, ilium ; isch, isoluum ;
oM.for, obturator-foramen ; yect.tx.b, pectiueal tuber-
cle ; pub, pul>is. (from I>arkei" and Haswell's